prep: Initialization should wait instead of exit the servers. (#2872)

- Servers do not exit for invalid credentials instead they print and wait.
- Servers do not exit for version mismatch instead they print and wait.
- Servers do not exit for time differences between nodes they print and wait.

cmd/storage-rpc-client_test.go

@@ -104,6 +104,22 @@ func TestStorageErr(t *testing.T) {
 			expectedErr: errFileNameTooLong,
 			err:         fmt.Errorf("%s", errFileNameTooLong.Error()),
 		},
+		{
+			expectedErr: errInvalidAccessKeyID,
+			err:         fmt.Errorf("%s", errInvalidAccessKeyID.Error()),
+		},
+		{
+			expectedErr: errAuthentication,
+			err:         fmt.Errorf("%s", errAuthentication.Error()),
+		},
+		{
+			expectedErr: errServerVersionMismatch,
+			err:         fmt.Errorf("%s", errServerVersionMismatch.Error()),
+		},
+		{
+			expectedErr: errServerTimeMismatch,
+			err:         fmt.Errorf("%s", errServerTimeMismatch.Error()),
+		},
 		{
 			expectedErr: unknownErr,
 			err:         unknownErr,